Save ips as part of compute properties for ondemand clusters

[sentry-io[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: runhouse/resources/hardware/cluster.py

Function	Unhandled Issue
up_if_not	NotImplementedError: Cluster does not have an up method. It must be brought up manually. ... Event Count: 2
up_if_not	Exception: Received [403] from Den POST 'https://api.run.house/cluster/up': {'detail': 'Not authenticated'} ... Event Count: 2

📄 File: runhouse/resources/hardware/on_demand_cluster.py (Click to Expand)

| Function | Unhandled Issue | | :------- | :----- | | **`__init__`** | [**AttributeError: 'NoneType' object has no attribute 'startswith'**](https://runhouse.sentry.io/issues/6076181510/?referrer=github-open-pr-bot) runhouse.rns.rns_client in for...
`Event Count:` **1** |

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[carolineechen]

• #1451 👈 (View in Graphite)
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